Improvement in wheels for dressing stone



P. a. LAIBD.

WheeI for Dressing Stone.

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UNITED STATES PATENT OFFICE.

PETER BpLAIRD, OF ST. JOHNSBURY, VERMONT, ASSIGNOR TO HIMSELF AND ROBERTW. LAIRD, OF SAME PLACE, AND HIRAM MOODY, OF

PEAOHAM, VERMONT.

IMPROVEMENT IN WHEELS FOR DRESSING STONE- Specitication forming part ofLetters Patent No. 159,031, dated January 26, 1875; application filedOctober 28,1874.

and Fig. 3 a bottom view, of one of my im-- proved dressing or polishingwheels.

The wheel in common use for dressing or reducing or polishing with sand,or a gritty or smoothing powder or material, the plane surface of astone, has been a disk of metal, having an eye or hole at its center forreception of the sand or reducing matter. Such a wheel has usually beenconnected to a vertical rotary spindle or shaft by a universal joint, orits equivalent, carried by a swing frame or arm, in order that the wheel(usually made of castiron) might rest flatwise upon the stone, andwhich, revolving rapidly, be moved over its surface to either smooth orpolish it. Such a wheel has usually required a boy or person to feed itwith the reducing material by pouring such into the eye.

My improvement saves the necessity of so feeding the wheel, and thelabor and expense of the attendant for the purpose, as with myimprovement the sand or material laid upon the surface of the stone willbe seized by the wheel at its circumference, and drawn into it, andretained in it until it may have performed its office.

In carryin g out my invention I form the wheel with what I term hookedrecesses a a a, made or arranged in it, from its bottom surface upward,substantially in manner as shown in the drawings, these recesses havingbetween them reducing-surfaces b b b. The arrow 0 in Fig. 3 exhibits thedirection in which the wheel is to revolve. The rear edge of each recessis curved or hooked, as shown at d e f, the front edge being alsosimilarly arranged. This leaves the recesses with broad months oropenings at their outer ends. The several recesses I prefer to haveopeninto each other at the center of the wheel, in order that the sandor reducing material drawn into one may have free access to and beforced into the others.

When the sand or reducing material is introduced at the center 'of thewheel, and the lower surface of such wheel is a plane surface, orwithout recesses, the centrifugal force generated by the revolution ofthe wheel causes the sand to be thrown out from underneath the wheel;but with my improvement the sand is caught at the circumference of thewheel by the curved or hooked back of each recess, and by such is drawninto the wheel, and held therein against the centrifugal force tendingto eject it.

What I claim as my invention is-- A metallic stone-dressing wheel, having hooked recesses a, as described, arranged in or with its lower orreducing surface 1), substantially in manner and to operate asexplained.

PETER B. LAIRD.

Witnesses It. H. EDDY, S. N. PIPER.

